US3785431A - Rotary regenerative heat exchangers - Google Patents

Rotary regenerative heat exchangers Download PDF

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Publication number
US3785431A
US3785431A US00178248A US3785431DA US3785431A US 3785431 A US3785431 A US 3785431A US 00178248 A US00178248 A US 00178248A US 3785431D A US3785431D A US 3785431DA US 3785431 A US3785431 A US 3785431A
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US
United States
Prior art keywords
rotor
plate element
heat exchanger
central plate
housing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00178248A
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English (en)
Inventor
B Pettersson
K Karlsson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Svenska Rotor Maskiner AB
Original Assignee
Svenska Rotor Maskiner AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Svenska Rotor Maskiner AB filed Critical Svenska Rotor Maskiner AB
Application granted granted Critical
Publication of US3785431A publication Critical patent/US3785431A/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D19/00—Regenerative heat-exchange apparatus in which the intermediate heat-transfer medium or body is moved successively into contact with each heat-exchange medium
    • F28D19/04—Regenerative heat-exchange apparatus in which the intermediate heat-transfer medium or body is moved successively into contact with each heat-exchange medium using rigid bodies, e.g. mounted on a movable carrier
    • F28D19/047—Sealing means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D19/00—Regenerative heat-exchange apparatus in which the intermediate heat-transfer medium or body is moved successively into contact with each heat-exchange medium
    • F28D19/04—Regenerative heat-exchange apparatus in which the intermediate heat-transfer medium or body is moved successively into contact with each heat-exchange medium using rigid bodies, e.g. mounted on a movable carrier
    • F28D19/048—Bearings; Driving means
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S165/00—Heat exchange
    • Y10S165/009—Heat exchange having a solid heat storage mass for absorbing heat from one fluid and releasing it to another, i.e. regenerator
    • Y10S165/013—Movable heat storage mass with enclosure
    • Y10S165/016—Rotary storage mass
    • Y10S165/02—Seal and seal-engaging surface are relatively movable
    • Y10S165/021—Seal engaging a face of cylindrical heat storage mass

Definitions

  • This invention relates to rotary regenerative heat ex changers of the type which comprises a housing, a rotor mounted in said housing, said rotor including a central rotor post and a cylindrical shell interconnected by radial partitions subdividing the rotor into a plurality of open-ended sectorial compartments for a heat exchanging mass, said housing being provided with inlet and outlet ducts for a heating fluid and a fluid to be heated and said rotor being joumalled at one end in a thrust bearing means and at the other end in a radial bearing means permitting axial movements of said other end due to thermal expansion.
  • sealing plates including at each end of the rotor a central plate element and two radially extending outer plate elements hingedly connected to two opposite edges of the central plate element, at least one member of said radial bearing means being mounted to move axially together with said other rotor end, and the central plate element of the adjacent sealing plate being held by said bearing member.
  • Heatexchangers of this type are often used asair preheaters in boiler plants in which the combustion gases used as heating medium may have a temperature of 350C or more.
  • the rotor In cold condition the rotor has the form of .a flat cylindrical disc but when heated by the combustion gases it does not only undergo thermal expansion but in addition it becomes dished.
  • each outer sealing plate element at one rotor end is usually connected to the outer end of the outer sealing plate element at the other rotor end axially aligned therewith and the swinging system thus formed is counter-balanced by a counterweight whereby the sealing plates are floating.
  • Such arrangements are shown for instance in British Pat. specification No. 1,] 18,710. In this way the dishing of the rotor is at least partly compensated for by the swinging system which adapts itself to the form of rotor.
  • the heat exchanging mass offers a resistance to the fluid flows resulting in a pressure drop so that the fluid pressure upstream of the preheater is always higher than the pressure downstream thereof. Therefore, when a rotor compartment during its passage from the air side to the gas side of the preheater has reached a position between the sealing plates in which it is still in communication with the air side thefloating plate system will be pressed towards the cold end of the preheater by the pressure difference. However, as the compartment is shut off from the air side by the trailing partition and immediately afterwards is put into communication with the gas side the system is pressed in opposite direction. In this manner the sealing plates will oscillate continuously during operation.
  • the invention has for its object to provide means whereby to obviate the above-mentioned drawbacks and to attain this object the heat exchanger according to the invention is characterized by stabilizing means included in the connection between the axially movable member of the radial bearing and the adjacent central plate element and adapted to prevent tilting of the central plate element during operation of the heat exchanger.
  • FIG. 1 is an axial partial sectional view of a rotary regenerative air preheater embodying the invention and diagrammatically illustrates the general design of the preheater
  • FIG. 2 is a plan view on a larger scale of a portion of the preheater as seen from line IIII in FIG. 1,
  • FIG. 3 is a cross-section along line Ill-III in FIG. 2,
  • FIG. 5 is a cross-section along line V-V in FIG. 2,
  • FIG. 6 is a view of a portion of the preheater as seen from below in FIG. 1,
  • the preheater shown in FIG. I is of the well-known general type having a rotatable cylindrical regenerator body or matrix forming a rotor 10.
  • the rotor consists of a trunnioned central rotor post 12 and a cylindrical shell 14 interconnected by radial partitions (not shown) subdividing the rotor into a plurality of openended sectorial compartments each containing a heat exchanging mass usually in the form of packages 16 of corrugated plate elements.
  • the rotor I0 is mounted in a housing comprising a cylindrical peripheral wall 18.
  • the end walls of the housing are defined mainly by the inlet and outlet ducts for the heat exchanging fluids.
  • duct 20 may be assumed to be the inlet duct for the hotflue gases and duct 22 the outlet duct for the cooled gases. Accordingly there is an inlet duct 24 and an outlet duct 26 for the air as fragmentarily indicated at the left hand side of the figure.
  • the ducts 20 and 26 at the upper end of the housing are separated by a beam 28 of U-shaped cross-section which extends diametrically across the upper end surface of the rotor and the flanges of which form parts of the duct walls.
  • a similar beam 30 is provided at the lower end of the housing.
  • the axially aligned ends of the beams 28, 30 are rigidly interconnected by vertical pillars (not shown) which together with the beams form a rigid rectangular frame supporting the housing structure and resting on a firm and stable foundation (not shown).
  • sealing plates 40 between the beams 28, 30 and the end surfaces of the rotor 10.
  • annular space between the rotor shell 14 and the peripheral housing wall 18 is sealed off by resilient sealing strips 42 secured to the wall 18 and slidingly cooperating with the outside of peripheral rings 44 at the ends of the rotor 10.
  • the radial bearing 38 comprises a housing 46 in which are mounted the outer races of two axially spaced ball bearings 48 and 50.
  • the inner races of these ball bearings are separated by a spacer sleeve 52 and the inner race of the lower ball bearing rests on a spacer element 54 which in turn is carried by a shoulder 56 on the upper trunnion 12B of the rotor post 12.
  • the whole bearing assembly 38 is carried by the end portion of the trunnion 128.
  • each fork shank carries a pivot pin 66 projecting into a corresponding bore in the bearing housing 46.
  • the bearing housing 46 is provided with two lugs 68 to which are pivotally connected the upper ends of turnbuckles 70.
  • the lower ends of the turnbuckles 70 are pivotally connected to arms 72 secured to torsionally rigid bars or shafts 74 extending longitudinally of the beam 28 and being rotatably journalled in brackets 76 secured to the web portion of the beam 28.
  • Each sealing plate 40 consists of a central plate element 40A and two radially extending outer plate elements 40B hingedly connected to two opposite edges of the central plate element the axes of the hinges being indicated by reference numeral 58 in FIGS. 2 and 3.
  • the shafts 74 are of substantially the same length as the central plate element 40A and to the end portions of the shafts are secured arms 78 to which are pivotally attached vertically extending pins 80 of adjustable length which pass through the beam web and at their lower ends are secured to the central plate element 40A near the corners thereof.
  • the central plate element is suspended from the arms 78 and its weight is transferred through shafts 74 and turnbuckles to the bearing housing 46.
  • the position of the central plate element 40A relatively to the upper end surface of the rotor 10 may be properly adjusted by means of the turnbuckles 70 and the pins 80. This relative position will be maintained also when the rotor is heated because at the axial thermal expansion of the rotor and the rotor post the bearing assembly 38 moves upwardly together with the upper trunnion 12B thereby turning the shafts 74 such as to lift the pin and the central plate element fastened thereto.
  • the central plate element 40A is suspended such that it moves vertically in unison with the bearing assembly 38 without changing its spatial orientation and it is capable to withstand external forces without tilting or being deformed.
  • the link and shaft system connecting the central plate element 40A with the bearing assembly 38 forms a stabilizing means for the central plate element.
  • the sealing plate 40 at the lower end surface of the rotor 10 also comprises a central plate element 40A and outer plate elements 408 as indicated by dotted lines in FIG. 6.
  • the central plate element 40A is not axially movable but secured to the lower beam 30 in desired position relatively to the lower end surface of the rotor by means of adjustable bolt devices 82 (only diagrammatically shown in FIG. 6).
  • the outer plate elements 40B of the lower sealing plate 40 are connected to the central plate element 40A by hinges 58 in the same manner as the upper ones. Near its outer end each outer plate element 408 is provided with two pins projecting through the web portion of the lower beam 30 and pivotally connected to the horisontal arms of bell cranks 84 the vertical arms of which are interconnected by a turnbuckle 86.
  • One of the bell cranks 84 of each plate element 403 is secured to a common torsionally rigid bar or shaft 88 which extends along the beam 30 such as to compel the two bell cranks to move in unison.
  • a sealing strip 40C is provided to seal and cover the gap (or slit) between the respective relatively movable sealing plate elements 40A and 40B.
  • Each outer plate element 408 at the lower end of the rotor is connected to the outer plate element 408 at the upper end aligned therewith.
  • This connection may be of any suitable type for instance similar to that disclosed in the above-mentioned British Pat. specification No. 1,1 18,710 but for the sake of simplicity it is in the present case shown as consisting of a link 92 (FIG. 7) pivotally connected to the plate elements. Though not illustrated this link may be made as a turnbuckle or be otherwise adjustable as to its length.
  • said stabilizing means comprise at least one rotatable, torsionally rigid bar journalled in bearings supported by the housing structure, a plurality of fastening means secured to the central plate element, a plurality of arms non-rotatably secured to and spaced along said bar, a link connecting one of said arms with said bearing member and links connecting the remaining arms with said fastening means whereby .to cause said central plate element to move axially in unison with said bearing member.
  • a heat exchanger as defined in claim 2 in which said bar is parallel with a line interconnecting the midpoints of said opposite edges of the central plate element and carries arms connected to fastening means located adjacent to said edges.
  • a heat exchanger as defined in claim 3 comprising two rotatable bars carrying arms connected to fastening means adjacent to the ends of said edges.
  • each wall of the housing includes a substantially diametrically extending beam and said stabilizing means are carried by said beam.
  • a heat exchanger as defined in claim 1 in which the outer end of each outer sealing plate element at one rotor end is connected to the outer end of the outer sealing plate element at the other rotor end axially aligned therewith.
  • a heat exchanger as defined in claim 1 in which the outer ends of the outer sealing plate elements at at least one rotor end are interconnected by further stabilizing means preventing the plate elements from moving in different axial directions.
  • a heat exchanger as defined inclaim 10 in which further stabilizing means are provided at one rotor end, the stabilizing effect being transferred to the plate elements at the other rotor end by the connections between axially aligned plate elements.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
US00178248A 1970-09-08 1971-09-07 Rotary regenerative heat exchangers Expired - Lifetime US3785431A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4293370 1970-09-08

Publications (1)

Publication Number Publication Date
US3785431A true US3785431A (en) 1974-01-15

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US00178248A Expired - Lifetime US3785431A (en) 1970-09-08 1971-09-07 Rotary regenerative heat exchangers

Country Status (6)

Country Link
US (1) US3785431A (es)
JP (1) JPS5440766B1 (es)
CS (1) CS163786B2 (es)
DE (1) DE2144593C3 (es)
GB (1) GB1303695A (es)
PL (1) PL77834B1 (es)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4024907A (en) * 1976-01-08 1977-05-24 The Air Preheater Company, Inc. Sealing plate support
FR2358597A1 (fr) * 1976-07-12 1978-02-10 Svenska Rotor Maskiner Ab Dispositif assurant l'etancheite entre l'arbre de rotor et l'enveloppe de rotor d'un generateur rotatif en autorisant des mouvements thermiques relatifs tant axiaux que radiaux
US4298055A (en) * 1980-08-27 1981-11-03 The Air Preheater Company, Inc. Actuated sector plate
US4705098A (en) * 1986-05-02 1987-11-10 The Babcock & Wilcox Company Labyrinth articulation joint for regenerative air heater seal frame

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4206803A (en) * 1978-12-26 1980-06-10 The Air Preheater Company, Inc. Rotor turndown sensor and control
US4372371A (en) * 1981-10-13 1983-02-08 The Air Preheater Company, Inc. Trunnion air seal
DE102016011918B4 (de) * 2016-10-05 2018-05-30 Balcke-Dürr GmbH Regenerativer Wärmetauscher

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU200703A1 (ru) * Л. А. Лесниковский Регенеративный вращающийся воздухоподогреватель
US2873952A (en) * 1952-09-06 1959-02-17 Svenska Rotor Maskiner Ab Rotary regenerative heat exchangers for gaseous media
US3010703A (en) * 1959-02-09 1961-11-28 Air Preheater Sealing arrangement
US3250316A (en) * 1963-04-19 1966-05-10 Svenska Rotor Maskiner Ab Regenerative heat exchangers

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU200703A1 (ru) * Л. А. Лесниковский Регенеративный вращающийся воздухоподогреватель
US2873952A (en) * 1952-09-06 1959-02-17 Svenska Rotor Maskiner Ab Rotary regenerative heat exchangers for gaseous media
US3010703A (en) * 1959-02-09 1961-11-28 Air Preheater Sealing arrangement
US3250316A (en) * 1963-04-19 1966-05-10 Svenska Rotor Maskiner Ab Regenerative heat exchangers

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4024907A (en) * 1976-01-08 1977-05-24 The Air Preheater Company, Inc. Sealing plate support
FR2358597A1 (fr) * 1976-07-12 1978-02-10 Svenska Rotor Maskiner Ab Dispositif assurant l'etancheite entre l'arbre de rotor et l'enveloppe de rotor d'un generateur rotatif en autorisant des mouvements thermiques relatifs tant axiaux que radiaux
US4298055A (en) * 1980-08-27 1981-11-03 The Air Preheater Company, Inc. Actuated sector plate
US4705098A (en) * 1986-05-02 1987-11-10 The Babcock & Wilcox Company Labyrinth articulation joint for regenerative air heater seal frame

Also Published As

Publication number Publication date
JPS5440766B1 (es) 1979-12-05
GB1303695A (es) 1973-01-17
DE2144593B2 (de) 1980-01-24
DE2144593C3 (de) 1980-09-18
CS163786B2 (es) 1975-11-07
DE2144593A1 (de) 1972-03-09
PL77834B1 (es) 1975-04-30

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